Thread tension for automatically threading loom shuttles



Oct. 27, 1925. 1,559,224

. E. A. CUNNIF'F THREAD TENSION FOR AUTOMATICALLY THREADING LOOM SHUTTLES Filed July e, 1925 E8 WQM ATTORNEY INVENTORJ Patented Oct. 27, 1925;

UNI-TED STATES PATENT on-"1 cc.-

EDWARD A. cumrrrr, or WALTHAM, uassacnusn'r'rs, assrenoa 'ro DRAPEB con- PQRATION, or HOPEDALE, massacnusnrrs, A conroaa'rron or MAINE.

'rnamn TENSION roa AUTOMATICALLY 'rnm'ianmc noon snu'rrms.

Application filed July 6, 1925. Serial No. 41,583.

To all whom z't'may concern:

Be it known that I, EDWARD A. CUNNIFF, a citizen of the United States, residing at \Valtham, county of Middlesex, and State of Massachusetts, have invented an Improvement in .Thread Tensions for Automatically Threading Loom Shuttles, of which the following description, in connect-ion'with the accompanying drawings, is a 1 specification, like characters on the drawings representing like parts.-

This invention relates vto automatically threading loom shuttles and more particularly to tension means in such. shuttles for exerting tension upon' the thread during weaving,

It is now the ordinary practice to provide automatically threading loom shuttles with tension means to'insure'proper delivery of the weft or filling thread during weav ing. Such tension, means, however, when employed in automatically threading loom shuttles, must offer no obstruction to the automatic threadin operation on the first pick of the shuttle, llowing replenishment, and should act upon the thread thereafter to insure that the weft or filling thread shall be laid straight in the shed. Such tension means should also be adapted to cooperate properly with the particular character ofthread in use without injury thereto; for instance, a: shuttle tension which may be adapted for-use in connection with one kind or character of filling may be altogether unsuitable for another kind or character of filling. This is particularly,

observable inautomatically threading shuttles wherein the weft or filling thread is of silk or worsted, which require a nonabras'ive action upon the thread, such as would not be liable to'cause injury thereto. v

One of the objects of the resent invention therefore, is to provide an automatically threading loom shuttle with a tension device which will not only not interfere with the automatic threading of the shuttle on the first pick following replenishment, but will be adapted for cooperation with any kind or character of filling to insure proper tension upon thethread during weavln The invention and new combination of parts will best be made clear from-the following description and the accompanying drawings of one-good form thereof.

In the drawings: a v Fig. 1 is a perspective view of one end of a shuttle provided with the present invention; I

Fig. 2 is a lon itudinal section at 'one side of the longitu inal axis of the shuttle,

and I Fig. 3 is across-section on the line 3-3 of Fig. 2. e r i Theshuttle bod 1 may be. of usual character, preferably ormedof wood, inwhich is mountedthe filling. carrier or bobbin 2 on which the fillin" 3 is wound, such filling carrier or bobbin ing held in the shuttle by the usual bobbin holding jaws '(not "shown, "since such bobbin holding jaws are now well understood). Below the bobbin chamber the shuttle is provided with an opening 4 through which the denuded filling carrier may be ejected on replenish ment of filling.

The shuttle herein shown is especiall ada ted for use in connection with a we&

or 11mg; thread formed of silk, the delicate nature of which requires a special charactor of tension means, andthe invention willbe described in this connection, al-

though it is to be understood that itis not necessarily limited thereto, sincev the tension device is adapted for use in connection with any character or kind of'filling em-' ployed in a filling replenishing shuttle.

Frontward of thebobbin chamber the wood of the shuttle is cut awa' to provide a threading block receiving camber 5 in which is mounted the threading block 6, preferably formed of metal and having a longitudinally extending thread passage 7 The threading block 6 is provided with a thread director 8 having the end portion 9 extended laterally .of the thread passage andunderlying a guard- 10, as shown, the constructionbein such that once the shuttle isreliminari y threaded, as on the first pic following replenishment, it will not thereafterv escape 'from the control of the threadin block. Frontward of the vthreading bloc the wood of the shuttle is cutawa as at 11 to rovide a thread assage leading" to the si e delivery eye 1 a. T e

, following replenishment and thereafter be fully threaded on the return pick of the shuttle. y

The threading block 6'is provided with an undercut portion 13 adjacent the bobbin chamber, and as shown, such undercut portion of the threading block has a rounded contour in which is mounted the thread tensiondevice. In the present instance of the invention, the threading block 6 has'also a downwardly extending stud 14 into which is threaded the head screw 15, which'may constitute oneform of means for holding the threading block in the threading block receiving chamber.

In the present instance of the invention, the longitudinally extending thread passage is provided with a top opening 16 through which the thread sage on the first pick of the shuttle following replenishment, and the lower wall 17 of 'the thread passage has a bridge 18 over which'the thread 0 passes on its way to the sidedelivery eye 12. Y

Extending transversely through the shuttle within the chambered portion 13 of the threading block is a bolt 19 having a threaded end portion 20 engaged within the internally threaded bushing 21 secured in the shuttle body. The bolt 19 has mounted thereon the disks 22 and 23 each of which is provided with a a convex surface 24 laced face to face, as indicated in Fig. 3, t e portion of .the disks below the convex portions 24 being preferabl arranged to receive between them the we t or filling thread a when the shuttle is -completely threaded. Between the disks 23 and the adjacent side wall of the shuttle is a washer 25ragainst which the flat face of the disk 22 bears, and similarly the washer 26 is mounted on the bolt 19 and bears against the fiat outer face of the disk 23. Interposed between the disk 26 and the head 27 of the bolt 19 is a spring 28 which acts throu h the washer 26 upon the disk 23 to hold t e two disks in thread tensioning position, the amount of tension exerted on the thread being regulated by adjustment of the bolt 19.

The bolt 19 and the disks 22 and 23'are disposed within the recessed chambered portion 13 below the top portion of the thread mg block, and the opening between the disks 22 and 23 is disposed laterall to one side of the opening 16 of the threa ing block, as 1nd1cated in Fig. 3, the construction being such that when the thread passes downwardly through the openin 16 leadin to the thread passage, it will deflected? by asses to the thread pas-- the convex walls 24 of the disk as it moves downwardly into its final position, as indi cated in Fig. 3.

Where the filling in use is made of silk or worsted, for instance,thetensioning disks 22 and 23 will preferably be formed of porcelainto thereby exert no in'urious action upon the filling, and as the lling is withdrawn from the bobbin the porcelain disks will exert tension upon the thread during its movement through the longitudinally extending thread passa e.

The top surface 0 the bolt 19 on which the thread normally rests when in final threaded position is above the horizontal plane passed through the bridge 18, with the result that the filling thread a is deflected downwardly over the top of'the bolt 19 on its way to the side delivery eye. The effect of this is that notwithstanding the rotative movement of the porcelain disks 22 and 23, there will be no tendency exerted by them to throw the filling thread upwardly out of engagement with or from between their con tacting surfaces, but, on the contrary, the

downwardly deflected thread in the thread 7 passage will remain in tensioning position between the convex-faces of the disks dur-.

tensioning position between the disks;

What is claimed is:

1. In an automatically threading loom shuttle, the combination of a threading block having a longitudinally extending threading passage and an undercut chambered portion formed in the block adjacent the bobbin chamber, two disks within the undercut chambered portion of the threaded block.

provided with convex surfaces arranged face to face below overlying portions of the block, and a threaded bolt passing trans versely through the chambered portion of the threading block on which the disks are mounted.

2. In an automatically threading loom shuttle, the combination of a threading block having a longitudinally extending thread portion adjacent the bobbin chamber connecting with the thread passage, two disks in the chambered portion of the threading block having convex surfaces arranged face to face below and at one side of the top nt ance to the thread passage, a bolt ex-- passageand an undercut chambered, I

tending transversely of the undercut chambered portion of the block on which the disks are mounted, the upper surface of the bolt being above the lower wall of the longitudinally extending thread passage that the thread may be deflected downwardly in the thread passage on its wayto the side delivery eye.

3. In an automatically threading loom shuttle,v.the combination of a threading block having a longitudinally extending threading passage and an undercut chambered portion formed in the block adjacent the bobbin chamber, two porcelain disks within the chambered portion of the threading block provided with convex surfaces arranged face to face below and at one side of the top entrance to the thread passage, and a threaded bolt assing transversely through the chambered portion of the threading block on which the disks are mounted.

4. In an automatically threading loom' shuttle, the combination of a threading block having a longitudinally extending thread passage provided with a bridge at its forward end over which the thread passes to the side delivery eye, said threading block having an undercut chamber frontward of the bobbin chamber beneath the top opening of the thread passage, two convex porcelain threaded bolt on which disks within the undercut chamber underlying portions of the block and at one side of the top entrance to the thread passage, a the disks are mounted with the convex surfaces face to face, and a spring acting upon one of the porcelain disks.

5. In an automatically threading loom shuttle, the combination of a threading block having a longitudinally extending thread passage provided with a bridge at its forward end over which the thread passes to the side delivery eye, said threading block having anundercut chamber formed in the block frontward of the bobbin chamber below overlying portions of the block forming the top opening of the thread passage, two

convex porcelain disks within the undercut chamber, a threaded bolt on which the disks are mounted with the convex surfaces face to face, the upper surface of the bolt being above the horizontal plane passing through the bridge to deflect the thread downwardly on its way to the side delivery eye, and a spring acting upon one of the porcelain disks.

In testimony whereof, I have signed my name to this specification.

EDWARD A. CUNNIFF. 

